/*

 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "logging/log.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/timer.hpp"

#include "utilities/ostream.hpp"

double TimeHelper::counter_to_seconds(jlong counter) {

  double freq  = (double) os::elapsed_frequency();

  return counter / freq;

}

double TimeHelper::counter_to_millis(jlong counter) {

  return counter_to_seconds(counter) * 1000.0;

}

jlong TimeHelper::millis_to_counter(jlong millis) {

  jlong freq = os::elapsed_frequency() / MILLIUNITS;

  return millis * freq;

}

elapsedTimer::elapsedTimer(jlong time, jlong timeUnitsPerSecond) {

  _active = false;

  jlong osTimeUnitsPerSecond = os::elapsed_frequency();

  assert(osTimeUnitsPerSecond % 1000 == 0, "must be");

  assert(timeUnitsPerSecond % 1000 == 0, "must be");

  while (osTimeUnitsPerSecond < timeUnitsPerSecond) {

    timeUnitsPerSecond /= 1000;

    time *= 1000;

  }

  while (osTimeUnitsPerSecond > timeUnitsPerSecond) {

    timeUnitsPerSecond *= 1000;

    time /= 1000;

  }

  _counter = time;

}

void elapsedTimer::add(elapsedTimer t) {

  _counter += t._counter;

}

void elapsedTimer::start() {

  if (!_active) {

    _active = true;

    _start_counter = os::elapsed_counter();

  }

}

void elapsedTimer::stop() {

  if (_active) {

    _counter += os::elapsed_counter() - _start_counter;

    _active = false;

  }

}

double elapsedTimer::seconds() const {

 return TimeHelper::counter_to_seconds(_counter);

}

jlong elapsedTimer::milliseconds() const {

  return (jlong)TimeHelper::counter_to_millis(_counter);

}

jlong elapsedTimer::active_ticks() const {

  if (!_active) {

    return ticks();

  }

  jlong counter = _counter + os::elapsed_counter() - _start_counter;

  return counter;

}

void TimeStamp::update_to(jlong ticks) {

  _counter = ticks;

  if (_counter == 0)  _counter = 1;

  assert(is_updated(), "must not look clear");

}

void TimeStamp::update() {

  update_to(os::elapsed_counter());

}

double TimeStamp::seconds() const {

  assert(is_updated(), "must not be clear");

  jlong new_count = os::elapsed_counter();

  return TimeHelper::counter_to_seconds(new_count - _counter);

}

jlong TimeStamp::milliseconds() const {

  assert(is_updated(), "must not be clear");

  jlong new_count = os::elapsed_counter();

  return (jlong)TimeHelper::counter_to_millis(new_count - _counter);

}

jlong TimeStamp::ticks_since_update() const {

  assert(is_updated(), "must not be clear");

  return os::elapsed_counter() - _counter;

}